Would like to change admin user id back to 1, but…

I installed this plugin and everything seemed to work perfectly. My admin name isn’t “admin” btw. But the user account was of course id=#1, but with BWPS I’ve let it change to another ID. Due to many reasons like being unable to change several setting WITHOUT being user #1, i’t like to change the admin user ID back to #1.

How can I do this? And: Why isn’t there an option to undo this setting in BWPS?